Android, how transfer big amount of data to web service via ksoap2?

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I have a big problem when I try to send big amount of data to web service. I need to send about 20-30 photos to web service. I convert all photo to base64 strings and send to web service. The problem is that when I send 1 photo is ok, but when I try to send 2 photo or more I have out of memory exception.
My code:

Java

public boolean TransferAccidentFromGisToRarParameters(List<String> photos) {
    String METHOD_NAME = "TransferAccidentFromGisToRarParameters";
    String SOAP_ACTION = NAMESPACE + METHOD_NAME;
    request = new SoapObject(NAMESPACE, METHOD_NAME);
    envelope.setOutputSoapObject(request);

    SoapObject photosList = new SoapObject(NAMESPACE, "accidentPhotos");

    for (String string : photos) {
        photosList.addProperty("string", string);
    }
    request.addSoapObject(photosList);
    try {
        androidHttpTransport.call(SOAP_ACTION, envelope);
        SoapPrimitive response = (SoapPrimitive) envelope.getResponse();
        return Boolean.parseBoolean(response.toString());
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
}

Where: photos - a list of base64 strings

My web service code block (asmx web service):

C#

[WebMethod]
public bool TransferAccidentFromGisToRarParameters(string[] accidentPhotos)
{
    try
    {
        foreach (var photo in accidentPhotos)
        {
            var byteArray = Convert.FromBase64String(photo);
            var accidentMedia = new AccidentMedia { Content = byteArray};
            entities.media_accidents.AddObject(accidentMedia);
        }
        entities.SaveChanges();
        return true;
    }
    catch (Exception exc)
    {
        return false;
    }
}

This is exceptions in Android log:

Java

FATAL EXCEPTION: AsyncTask 
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:278)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.OutOfMemoryError
at java.nio.CharBuffer.put(CharBuffer.java:509)
at java.nio.charset.CharsetDecoder.allocateMore(CharsetDecoder.java:238)
at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:195)
at java.nio.charset.Charset.decode(Charset.java:487)
at java.lang.String.<init>(String.java:174)
at java.lang.String.<init>(String.java:141)
at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:121)
at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:95)
at com.rossoft.epolice.services.GisWebService.TransferAccidentFromGisToRarParameters(GisWebService.java:191)
at com.rossoft.epolice.asynctaskwrappers.AsyncTaskTransferAccidentWrapper.doInBackground(AsyncTaskTransferAccidentWrapper.java:48) 
at com.rossoft.epolice.asynctaskwrappers.AsyncTaskTransferAccidentWrapper.doInBackground(AsyncTaskTransferAccidentWrapper.java:1) 
at android.os.AsyncTask$2.call(AsyncTask.java:264) 
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
</small>

I'll be glad for your answers. Best regards!

Posted 19-Nov-12 22:17pm

Vladislav Socolov

Updated 20-Nov-12 4:41am

v3

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2 solutions

Solution 1

one photo at a time. Not all photos at once.
make the loop a bit bigger, so the complete Request is carried out for each Object of the List.

Posted 19-Nov-12 23:05pm

TorstenH.

Comments

Vladislav Socolov 20-Nov-12 5:24am

Not it's not a solution. Imagine if instead of photo I will have a video? I need to transfer all data in one request.

TorstenH. 20-Nov-12 9:32am

You did not say anything about videos.
How is "video" related to "photo"?
Is "video" one Object?
That code does only process "photo" to my point of view.

At least your variable naming is not clear.

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pip010 · Accepted Answer · 2012-11-21T21:42:00

I had to do the same functionality. Uploading a camera pic ~10Mb to a remote gallery.
here is what i did:
1)resize to 1024x768 , approximate! while keeping ratio consistent
(can share code)
2)do a multi-part post http request
(this was tricky) using the apache httplib is trivial, problem is my target was 2.2 and the version of the lib was too old and not supporting that feature.
solution: bind latest jar of httplib with your app
or, stitch your http request by hand (again i can provide some code)

let me know

btw SOAP service is not what you would want to do here. handling plain old post request it is ;)